Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b926a384da88d1…

MALICIOUS

PDF

80.6 KB Created: 2021-09-23 03:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 78a1d86ba4b75c9e04560e80a66258ba SHA-1: 1df74e14279d26552c9f23eb660c66f900242612 SHA-256: b8b926a384da88d1b54fbef43a8fefae2ea60cb8d5f1d5ecd68f50879a9975bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://drafthe.ru/uplcv?utm_term=geotechnical+engineering+of+dams PDF link annotation
    • http://rayocazar.com/images/elfinder-1.1/files/file/17303235623.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/75059876348.pdfIn PDF document text
    • https://tadimtursu.com/image/files/12248837971.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/vepak.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/95667484316.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/17884060469.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/95368299762.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/bitoxolitekewedageber.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/63211567867.pdfIn PDF document text
    • http://ihdbd.org/upload/files/xajasomixuridofejup.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7dc86582b---62131885692.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/noginipakarovif.pdfIn PDF document text
    • https://bela.geekers.tw/upload/file_folder/file/pupari.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/67685120651.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/62422592085.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/julebajamoj.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/74375250354.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/fbbcee5be72ee7fb305f216891748086/42395741816.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/75115865335.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/42303362801.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/72416521193.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210918211105.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 10964 bytes
SHA-256: 2f579fb3e3498feb024f89ca3108156f8590ff4832a0bdc559054f0c8fffa35d
font_02_sfnt_off0001090d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 16736 bytes
SHA-256: ac1a43f24a71e80874ae679c35a7bb2d87eda4edee2a320478b6bf1a40496863

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